The problem with Palpy's make-up in Episode III is that it should have not been made to match the ROTJ make up. They shouldn't have tried to match him with ROTJ. All we knew about the Emperor in the days before the prequels was he was an old man when he declared himself Emperor and by the time ROTJ rolled around, he was a very old man. This change in ROTS seemed entirely unnecessary to me. He looked wrinkled and decrepit in ROTJ because he was just old.